5.2 Radiotelephony procedures
When Selective Calling (SELCAL) equipment is used certain of the following procedures are superseded by those contained in 5.2.4.
5.2.1.1 PANS. When a controller or pilot communicates via voice, the response should be via voice. Except as provided by 8.2.12.1, when a controller or pilot communicates via CPDLC, the response should be via CPDLC.
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Source: ICAO Annex 10.2